A kind of Bāhya Tapa (external austerities or Nirjarā (shedding Karma));
to cultivate the body (for spiritual practice) by undertaking different (Yogic) postures such as Vīrāsana and the like.
ṭhāṇā vīrāsaṇāīyā, jīvassa u suhāvahā. ugga jahā dharijjaṃti, kāyakilesaṃ tamāhiyaṃ...
(U 30.27)